How Do You Calculate the Coefficient of Friction in a Spring Problem?

AI Thread Summary
To calculate the coefficient of friction in a spring problem, one must apply the energy conservation principle, equating the initial and final energy states. The equation used includes potential energy from the spring and the work done against friction. The user initially miscalculated by not considering the force of friction multiplied by the distance in the energy equation. After reevaluation, the correct approach involves incorporating this frictional force to find the coefficient of friction accurately. Understanding the relationship between energy and friction is crucial for solving such problems effectively.
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Homework Statement



Question 6

http://web.viu.ca/hearnd/Courses/Phys121/F02Test2/Page3.htm"

Homework Equations



(Eps+EK)i-Ffr= (Eps+Ek)f

The Attempt at a Solution



both kinetics should be zero so..

1/2(50Nm)(0.10m)2+0-(0.50kg)(9.81m/s2)uk= 1/2(50Nm)(-0.08m)2+0

uk= (0.25-0.16)/(0.5kg)(9.81m/s2)

this must be wrong the posted answer is different then this would yield. This seems like a very straightforward question what am I missing?

Thanks
 
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figured it out...
Force of friction x distance in an energy equation duh.
 

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